Mastering English Modals and Grammar Structures
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Modal Verbs and Verb Forms
Past Ability: Used the third form of the verb.
Certainty and Ability
- Certainty: Must
- Ability (Present): Can (e.g., "I can study.")
- Ability (Past): Could, was able to, couldn't
- Ability (Future): Will be able to
Possibility
Use: Can, might, may, could.
- Past Conditional: Could (e.g., "I could study German at Soos Bay four years ago.")
Impossibility
Use: Can't, couldn't.
Speculation
- Positive Certainty (+): Must
- Possibility: May, might, could
- Negative Certainty (-): Can't/Couldn't
Obligation
- Present: Must (+++), have to (+)
Lack of Obligation
- Present: Don't have to, needn't, don't need to
- Past: Didn't have to, didn't need to, needn't have
- Other Tenses: To have to, to need to
Necessity
- Present: Need, to need
- Past: Needed, needed to
- Other Tenses: